New toek



(No Model.)

J. ELLIOTT.

BOILER FURNAGE.

Patented Nov. l, 1881E 1 r x H ll` Unirse Srarus Parana;

JAMES ELLIOTT, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR OF TWO- THIRDS TOROBERT ARTHUR KELLOND, OF SAME PLAGE, AND HASGAL ALFRED HOGEL, OFYONKERS, NEW YORK.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 248,925, dated November1, 1881.

Application filed April 15, 1881.

To all whom it may concern:

Be it known that I, JAMES ELLroTT, of the city and district of Montreal,in the Province ot' Quebec and Dominion of Canada, engineer, haveinvented a certain improvement which I believe to be new and useful inboiler-furnaces for the generation of steam and for other purposes. Thisimprovement is fully set forth in the following specification andaccompanying drawings.

The object of my invention is to save fuel inthe working ofsteam-boilers,and at the same time and by the same apparatus to obviatethe nuisance of smoke issuing from the chimney. This I claim to `haveaccomplished in a more simple, economical, and efficient manner thanheretofore by my improved apparatus, which consists in an arrangementwhereby the air supplied to the furnace is heated previously to beingintroducedegpder the grate-bars;o and at the same time the unconsumedgases are drawn by means of a jet orjets ofsuperheated steam and hot airover the tire-barsVthe ordinary opening for the admission of erternalair under the grate being' tightly closed. I attain these objects by themechanism illustrated in the accompanying drawings, in which- Figure lisan isometrical perspective sectional view as applied to an ordinarycylindrical boiler, in which certain parts are supposed to be removed inorder to show more clearly the entire improved arrangement.Fig.2isatrans verse section through the fire-box. Figs. 3, 4, and 5 areexternal and sectional views of my improved furnace-door, and Fig. 6 theseit'- regulating tap.

The sameletters referto similarparts throughout the several views.

Letter Arepresents the boiler, B, the bridge at back of furnace; O, thegratebars; D, the ash-pit; E, end plate oi'boiler-furnace, all whichparts are constructed in the ordinary manner.

The mouth ofthe ash-pit is provided with a door, F, which can be openedor closed at pleasure, but during the operation of my improved apparatusis kept tightly closed.

G G are iiues or, rather, air-passages built in the brick-work of thefurnace-walls or rpnning along the same, one on each side, toward the(No modell) top and close alongside of the tirechamber, eX-v 5o tendingtoward the back end of the boiler, where they are connected by theoutlet-s or openings a a with two similar return-dues or air-passages, HH, extending toward the front end, and having their ou tlets at b b,underneath the grate-bars. The outer ends of the passages Gr G areprotected by adjustable sliding doors or dampers c, mounted on the frontplate of the furnace-wall E, for the proper regulation of the amount ofair admitted for the hot-air draft. 6o This draft is further assisted byplacing aperforated pipe or channel, d, transversely in the passageleading from the furnace to the back ofthe boiler, and connecting thcsame by t'wo lateral pipes, e e, running along the passages H H to thenozzles ff, which deliver the heated air, together with the unconsumedgases, from the rear end of the boilerinto the furnace over thegratebars. also introduce into the iiues or passages H Hthe steam-pipesgg, con- 7o necting at h It with the steam from the boiler, passingthroughout the entire length of the passages H H, returning to thefront, and connecting at the nozzles ff with the pipes e e. By thismeansjets of highly-superheated steam are introduced over the ire, notonly drawing and injecting the hot air and gases from the back of theboiler, but at the same time consuming the smoke before it leaves thefurnace.

Another part ot' my improvement consists in 8o the employment of ahollow steam-heated furnace-door, J, which may be constructed as shownin Figs. 3, 4, 5, and 6. It is formed of iron plates, with sufficientspace between to admit of an internal steam-pipe, j, made into a coil,so as to expose the greatest possible surface to the action of the heatfrom the furnace. It is connected at the hinge by a self-regulating tapor cock, k, to a pipe, l, from the boiler, so that when the furnace-doorJis closed steam 9o is admitted into the coilj, and when partially orfully opened it is cut off.- The upper end of the coil j is providedwith one or more openings, m m, admitting the steam, after beingsuperheated,into thefurnace over the fire, The outer shell of thefurnace-door J, toward its lower side, is perforated with a number ofholes, a a, admitting the external air, which is thus highly heated,both by the furnace and steamcoil j, and introduced, in combination withthe jets of superheated steam, through the openings 'n 'n into thefurnace over the lire, thus assisting in the saving of fuel andconsumption of smoke effected by the other parts of my apparatus.

It will be seen that the lines H H serve a very useful purpose inprotecting the pipes e and g from the burning action ot' the tire,besides elfecting their primary object of holding said pipes in such aposition that the smoke in the pipes c and the steam passing through thepipes g may both become highly heated before being discharged into thetire-chamber.

My object in introducing the double tlucs Gr G and H H into my apparatusis to combine in the most feasible way means for covering and carryingthe pipes c and g, as above mentioned, and at the same time heating thecold air brought in from the front of the furnace to a high temperaturebefore discharging same under the grate-bars, and I lay no claim to anyother arrangement.

I do not claim, broadly, the use of heated air or of superheated steam,either singly or in combination, for the economy of t'uel or consumptionof smokein boiler-furnaces; nor do I herein claim, broadly, the methodof drawing and injecting the waste products of combustion into thefurnace for the some purposes; or of heating the air and superheatingsteam by the Waste heat of a furnace, because I am aware that all thesefeatures of invention have been previously in use in various forms; nordo I intend to limit the scope of my invention to the precise detailsherein described, and shown in the drawings, so long as the peculiarcharacter of any part of my invention is tetained; but,

Having thus fully described the nature of my invention, What I claim asnew, and desire to secure by Letters Patent, is as follows, viz:

1. In a furnace foi` generating steam or other purposes, a ue or passagemade in two divisions, one above the other, and connected by passagesnear the back, the upper fiuc or division receiving cold air fromoutside the furnace, and the lower liuc discharging same in a heatedcondition underneath the grate, in combination with and serving to holdpipes conducting smoke and steam to a point over the grate,substantially as described.

2. A furnace-door inclosing a pipe or coil of pipes to which steam isadmitted from the boiler, and from which iets are directed over thelire.

3. A furnace-door made hollow, receivinga coil of steam-pipes, andprovided with openings on its outer face for the admission of cold air,and similar openings on its inner side for the discharge of said air ina heated condition over the tire.

4. In combination with a hollow furnacedoor receiving air from outsideand discharging saine over the fire, a jet or jets of steam dischargedsimultaneously in the same direction, the supply being controlled by aself-acting cock or tap placed at the hinge of the door, allsubstantially as and for the purpose described.

. JAMES ELLIOTT.

Vitnesses:

CHARLES Renn, R. ARTHUR KELLOND.

